Reciprocating sheet handling device for flat-bed duplicating machines



H. JAGGl-:R 2,536,605 RECIPRCCATING SHEET HANDLING DEVICE FOR FLAT-BED DUPLICATING MACHINES Jan. 2, 1951 9 Sheets-Sheet l Filed Aug. 31, 1945 Jan. 2, 1951 H. JAGGl-:R 2,536,505 RECIPROCATING SHEET HANDLING DEVICE FOR FLAT-BED DUPLICATING MACHINES Filed Aug. 31, 1945 9 Sheets-Sheet 2 g1 q IN VEN TOR.

Jan. 2., 1951 2,536,605

H. JAGGER RECIPROCATING SHEET HANDLING DEVICE FOR FLAT-BED DUPLICATING MACHINES v 9 Sheets-Sheet 5 Filed Aug. 51, 1945 (gg IIN!" (D JNVENToR. wu JL-1 er" bv. BY H5 H. JAGGs-:R 2,536,605 RECIPROCATENG SHEET HANDLING DEVICE FOR FLAT-BED DUPLICATING MACHINES Jan. 2, 1951 9 Sheets-Sheet 4 Filed Aug. 51, 1945 NVENTOR. EHuber gger' y MEW ,OW MMM RECIPROCATING SEET HANDLING DEVICE FOR FLAT-BED DUPLICATING MACHINES Filed Aug. 31, 1945 l 9 Sheets-Sheet 5 1N V EN TOR.

Jger

Jan. 2, 1951 E H. JAGGER E RECIPRGCATING SHEET HANDLING DEVICE FOR FLAT-BED DUPLICATING MACHINES 9 Sheets-Sheet 6 Filed Aug. 51, 1945 wf CHW@ fb u M Jan. 2, 1951 H. JAGGER 2,536,605

RECIPRCCTING SHEET HANDLING DEVICE FOR FLAT-BED DUPLICATING MACHINES 9 sheets-sheet 7 Filed Aug. 3l, 1945 INVENTOR. J-[uber Ja k @Q L? UQZgS Jan. 2, 1951 H. JAGGER RECIPROCAIING SHEET HANDLING DEVICE EoR FLAT-BED DUPLICAIING MACHINES 9 Sheets-Sheet 8 fla fl? 5g?" INVENTOR.

Juber Jagger MM OM/,14

Jan. 2, 1951 H. JAGGER EECIPROCATING SHEET HANDLING DEVICE FOR FLAT-BED DUPLICATING MACHINES 9 Sheets-Sheet 9 Filed Aug. 51, 1945 IN1/Emme. jfl/bari Jcgger Patented Jan. 2, 1951 RECIPROCATING SHEET HANDLING DEVICE FOR FLAT-BED DUPLICA'IING MACHINES Hubert Jagger, Maywood, Ill.

Application August 31, 1945, Serial No. 613,726

7 Claims.

This invention relates to improvements in duplicating machines. i

One object of the invention is to provideV a duplicating machine of the flat bed type having improved means for operating the machine.

Another object of the invention is to provide a duplicating machine having a flat bed across which a sheet-laying and stripping mechanism is reciprocable and provided With a novel type of operable actuating mechanism therefor.

A further object of the invention is to provide a flat bed duplicator with a reciprocable sheethandling device which may be manually or power operated in one direction, and which is automatically operable in the reverse direction.

Other objects of the invention relate to various features of construction and arrangement of parts which will be apparent from a consideration of the following specications and accompanying drawings wherein:

Fig. 1 is a side elevation of aduplicating machine that is illustrative of the present improvements.

Fig. 2 is a vertical sectional view taken on line 2 '2 of Fig. 1.

Fig. 3 is a horizontal sectional view taken on line 3 3 of Fig. 1.

Fig. 4 is a broken Vertical sectional View taken on line 4 4 of Fig. 2.

Fig. 5 is a broken sectional View taken on line 5 5 of Fig. 1.

Fig. 6 is a broken sectional View taken on line 6 6 of Fig. 2.

Fig. 7 is a sectional View through the carriage, corresponding to the representation thereof shown in Fig. 6, but showing the platen or sheetlaying roll in a different operative position.

Fig. 8 is a vertical sectional View taken on line 8 8 of Fig. 4.

Fig. 9 is a horizontal sectional view .taken on line 6 9 of Fig. 4.

Fig. 10 is a broken Vertical sectional View taken on line I0 I 0 of Fig. 3.

Fig. 11 is a broken side elevation of a modified form of the duplicating machine arranged for power operation.

Fig. 12 is a horizontal sectional view taken on line I2 i2 of Fig. 11.

Fig. 13 is a broken elevation, partly in section, as viewed along the line I 3 I 3 of Fig. 11.

The duplicating machine shown in Figs. 1 to 10, inclusive, of the drawings, is of the iiat bed type, which normally employs a gelatine band and is designed for operation during the duplicating or working stroke of the machine, either vthe bed I3.

by the hand of the operator or by a conveniently located foot pedal, both modes of operation being considered as manual operation.

Referring to Fig. 1, numeral IIJ indicates generally a suitable casing for the machine, within which, for the most part, the operating structure of the mechanism is housed.

As shown in Fig. 1, the casing is provided4 with a door I I, providing access to the interior for adjustment or repair .of parts, or for other servicing. The height of the casing is such as to afford convenience in operation by an operator standing or sitting at the left hand side of the` machine, as viewed in Fig. l. The top surface of the casing is providedy with a bed plate I3, over which is adapted to be disposed a portion of a duplicating band I4, as of the gelatine type, and having end portions which are carried by spools or drums i5 and I6, the former at the forward side of the machine, and the latter at the rear side, as indicated in Fig. 4.

When the portion of the band I4, which overlies the bed I3 has been used and it is desired to duplicate the copyable matter on a second master sheet, the band is advanced forwardly or rearwardly to move a fresh section of the band in position upon the bed for receiving the transferable material from the second master. The

`rotation of drums I5 or I6 is accomplished by,

means of hand wheels I1 and I8, respectively, shown in Fig. 1. Normally, the drums are latched against operation, and, hence, ,against displacement of the exposed band portion that rests upon band toward the front of the machine, the hand lwheel I'I is operable in a counter-clockwise direction, as viewed in Fig. 1, which winds the band upon the drum, the band being paid out by the other drum I6. The drum I6 carries a ratchet wheel I9, a tooth of which normally is engaged by a spring-pressed pawl 2U, and, hence, when the band is being advanced, as above described, the pawl 2i! is manually retracted from engagement with the teeth of the ratchet I9 by means of a rod 2l, which is provided with a convenient knob or ngerpiece '22 accessible at the front of the machine.

When it is desired to` advance the band toward the rear of the machine, the handwheel I8 is operated ina clockwise direction, in which instance the pawl 2li slides over the teeth of ratchet I9, while a pawl 23, which normally is in engagement with the teeth of ratchet 24, carried by the drum I5, is held manually in inoperative position by Swinging fQlWardly a convenient iingerpiece When it is desired to advance the i 3 25 (see Fig. 1), which is shown as carried by the pawl 23. The knob 25 is accessible at the right hand side of the machine, as shown in Fig. 2.

The provision of pawls 25 and 23 enables the operator to tighten the band ifi adequately across the bed I3, after moving a fresh section of the band into operative position upon the bed. The drums I5 and I's are mounted for support in convenient bracketsi and 21, as illustrated in Fig. 2, the brackets being such as to facilitate removal of the band rolls when desired.

A carriage, indicated generally by the numeral 23, is arranged for reciprocating movement longitudinally of the bed I 3 and is :adapted to apply to the duplicator band I!! the copy sheets that are successively inserted in the carriage. The carriage is provided with a pair of anti-friction rollers 29 (see Fig. 9), adapted to travel upon the lateral edges of bed I3, the roll-rs being secured to brackets Sil, which are secured to the carriage casing. SI. The bracketsw :are provided with lateralxextensions :32, which .extend'beyond the adjacent marginsxor longitudinal edges of the bed I3, which extensions extend downwardly to form portions 53 (see Fig. 2) and thence'inwardly, ,providing portions 3ft-,whichilatter portions terminate in downward langes 435, which -are Yjournalledupon bearing member 36, carried by the npperiend of yan actuating leverl. lThe actuating rleyer 131,'. at.' its lower end-,iis'journalled to a reciprocating head 33,'w-hichis arranged for Vertical sliding movement within a guide, indicated :generally bythe numeral 39, and formed .of a pair of pedestal-like guide memberssi, which are 1secured .upon the base'A A#il Y of the casing, asindicated in` Figs. 1 andlO.

The members 50 are provided with channels Which cooperate toreceive the head 38, and are spaced apart sufficiently to accommodate therebetween the arm 3'I- as well -as alever 52, which, as shown in Fig. 1, is pivotallyv-mounted at 43 on asupportM. 'Theleft-hand end of the lever, as shown in Fig. l, extends over-the right-hand end ofafoot-operable lever 45,- which is pivotally mounted atrfi to asupport L56', and whichcarries a-pedal, or` other foot-actuatingdevice '58, at its outer end. .-Downward pressure at the pedal 48, -as by the operators foot, causes ithe lever 42 to -move-clockwise about the. pivot-t3, and, hence, to

move the head 33 downwardly within the guide 35. '.fDownwardmovement of the `head 38 moves .the lever 3? generally downwardly, and provides a component-thatl causes the carriage to move horizontaily tothe right, :as -viewedin Fig. 1. The :carriage may move.y tofthe right, as viewed in Fig. 1, until`A it engages anadjustable stop 0.1. The :stop Tis adjustable horizontally along one of .the'twoopposite slots 56a, withinv which the sectionstl of the brackets 13D are operable-during -thereciprocating movements of the carriage.

-T-hepositicning of the stop towardor away from the iront of the machine determines the vlength `of the stroke of thecarriage, which must -be correlated-to l'the length of -the copy sheets being employed. Hencefif. a 4copy sheet twelve Vinches-1in lengthf'is-being employed, the stop il will be positioned nearer the front-,of themarchinelthan in instances where longer copy sheets are being used. Thecarriage 23 may, or" course, be, moved. tothe right of the machine by hand operation, if desired, although operation by means of.A the foot pedal andv associated mechanism above -describedis preferred, since such leavesthe hands .of the operato:` freefor introducing. and removing copy :sheets frornthe carriage.

Within the casing Ill there is provided a pair of guide tubes 39, within which counterweights 5S are supported by means of cables 5I, which are guided by rolls 52 and 53, and are attached to the respective members 34. lThe counterweights 5l! are elevated when the carriage moves to the right, as viewed in Fig, 1, and serve to return the carriage to the left upon completion Vof the copying or right-hand stroke ofthe carriage.

Within the carriage casing 3| is a platen roll support comprising a pair of swingable brackets rEhe brackets are shown as being integrally connected by a transverse member 55 and as being pivotally mounted. upon a shaft 56, the ends of which are secured to the brackets 39.

Theforward Yend portions of the brackets 54 support a platen roll 58, which is provided with projecting axle members 55 and G9 by means of which the roll is rotatably journalled in the members l 513.

The axle member extendsthrough an arcuate slot 6I (see Fig. 4) provided in the yadjacent member S5, and at its outerend. is provided with a roller 52. The arcuate slot El' .permits the roll 5533 and the brackets 5@ to. swing arcuatelyfabout the axis of the Yshaft .55. The brackets-'55 are provided, as'shown in Fig. 6, with manually operable members '53, which teXtendithrough arcuate slots .provided therefor in the fcasing or vcover member 3l of the carriage 28, whereby the roll 58 may be manually lowered from a raised. position or by means of which it may. be elevated when desired.

Withinthe casing '3l is afsecondiroll 65, which is journalled in depending brackets 55, each pivotallymounted as at El, to an'adjacent end plate or bracket 3Q. The upper ends of the brackets @t are ext-ended forwardly Vandwrearwardly, as` shown, and over the rear extensionsrthereof are pre-vided springs 68 which .tend to swing'the roll 55 clockwise, as viewed in Fig. v6. -Thefor ward extensions of brackets 66 are adaptedto abut adjustablestop screws 513', which limit such rearward swinging movement. The axial center of the roll 55 is slightly higher than the axial center of roll 58, and the adjustment 'of the screws Sii' vpreferably is such thatxwhen'the'roll 58 is in lowermost position, as shownrin'Fig; 6, the pressure of-roll 55 against the roll 58 tends to retain the latter in the lowermost position. Swinging the vroll 58 in a'clockwise direction, as viewed in Fig. 5, or to the position shown in Fig. 7, spaces said rolls 58 and `55 apart as viewed in said Fig. 7.

ii/'hen the-roll 58 isin the position shown in the latter figure, a copy sheet may be slid down a paper guide 5S, whichis-shown as being-formed as part of the carriage casing, which guide'v will direct the sheet over roll and beneath the elevated roll 58 and into Contactl with a margin bar lll. Reverse movement ofthe roll 58, ipe., from the position shown inl Fig; 7 to the position shown'in Fig. 6, presses the adjacent end of the copy sheet, indicated by numeral 'l I, into contact with the duplicator band I4. As stated above, when the roll 58 is inthelower position, the roll 65 tends to retain the roll in such position, and, hence if the carriage .is now moved forwardly, or to the right, as viewed in Fig. 6, the copy sheet ll will be pressed progressively into contact with the surface of the duplicating band I4. The printing or copying movement of the carriage 28 may be effected, as `described above, by downward pressure upon the pedal- 48. Such movementlof the carriage is arrested upon contact with the stop member 47, which stop member is adjusted for arresting the movement of the carriage in a position preferably wherein the upper or trailing end of a copy sheet 'H will still protrude above the rolls 58 and 65, between which rolls the end of the sheet is firmly gripped. Upon the termination of the copying movement of the carriage, as mentioned, the counterweights 50 move the carriage rearwardly, or to the left, as viewed in Fig. 6. Such movement to the left causes the roll 58 to rotate counter-clockwise, as viewed in Fig. 8, and by reason of the pressure of the rolls 58 and 65 against the interposed sheet, such` movement of the carriage to the left, plus the rotating effect of roll 58, strips the copy sheet from the band I4. Thus each cop-y sheet, after having been pressed upon the band upon the movement of the carriage to the right, is stripped from the band by the movement of the carriage to the left. The sheets thus tend to slide out along the paper guide E8, upon movements of the carriage to the left although such stripping action is facilitated by engagement of the upper end thereof by the hand of the user. Thus, by the feeding of sheets into the carriage While the same is in the position shown in Fig. '7, and depressing the rolls 58 into the position shown in Fig. 6, and thereafter actuating the carriage by depression of the pedal 48, copies are made, while reverse movement of the carriage releases the copies from the band. The movement of the carriage to the left is arrested by cushion bumpers 'i2 secured to the casing I0.

Located within the casing of the machine is a vertically slidable elevator member 'i3 which is guided by pins 74 extending into slots provided in the member '(3. A spring 75 is secured at one end to the lower end of the member 73 and at the other end is secured to a stud 66, and tends to retain the member 73 in lowermost position, as shown in Fig. 4. The upper end of the member 'i3 is in vertical alignment with the roller 52 when the carriage is in the position shown in Fig 4 and is designed for upward movement for elevating the roll 58. Means for moving the member 3 upwardly against the action of spring 75 may comprise a lever 77 which is pivoted at 19-to the casing li) and is provided with a handle 8B projecting from the adjacent end of the casing IQ. The lever 77 operates within a slot 3|, provided in the forward wall of the casing I4. Downward pressure of the handle 8&3 effects elevation of the slide member i3, and, hence, elevation of the roll 58. the position shown in Fig. 6 to the position shown in Fig. '7, and release of the handle 8b, the spring 'i5 restores the slide member 'i3 to the position shown in Fig. 4, leaving the roll 58 in the elevated position, as shown in Fig. '7. The roll 58 can thus be elevated by depressing handle Si) only when the carriage is in the rearward position shown in Fig. 6,- although it may be elevated, in any position along the bed by means of the handles 63 or either of them.

For the purpose of facilitating the elevation of the roll 58 from copying position to the position shown in Fig. '7, foot-operable mechanism is provided. Such mechanism comprises a link 82 attached to the lever 77, and terminating at its lower enclin a pedal or footpiece 83, which is conveniently located for operation by an operator standing or sitting at the front of the machine. Utilization of the pedal 83 leaves the hands of the operator free, one for withdrawing a sheet from After elevation of the roll 58, as from the carriage, and another for inserting a fresh sheet into the carriage prior to the next copying stroke of the carriage, which, as above described, is effected by downward pressure of the pedal 48.

The modified structure shown in Figs. 11, 12, and 13 differs from that above described by the utilization of power means for effecting the working stroke of the machine. As shown in Fig. 11, the mechanism employs a link or arm 3T and lever 42 and associated mechanism similar to the above described form.

The foot operable lever 45 of the above form, however, is eliminated and there is substituted therefor a support member 84 which is pivoted at B5, and which preferably terminates at its forward end in a pedal 85, whereby the member 84 may be pressed downwardly by the foot of the operator, when desired.

As shown in Fig. 12, there is mounted on the swingable support, or platform 84, an electric motor 87 which is drivingly connected to a speedreducing member 33 of conventional construction. The shaft 39 of the speed-reducer carries an actuator arm 93, disposed beneath and in the vertical plane of the forward end of the lever 42. As viewed in Fig. l1, it willbe seen that rotation of the arm in a clockwise direction will effect rocking movement of the lever 42, and as described previously, such movement of lever 42 will effect the movement of the carriage 30 to the right. The length of the stroke of the carriage is determined by the angular position of the support 8d or the vertical position of the shaft 89 and, hence, if the pedal 3S is pressed downwardly from the position shown in Fig. 11, the extent of pivotal movement imparted by arm Sil to the lever 42 will be reduced and thus a shorter horizontal movement will be imparted to the carriage 30.

Pressing the pedal d down to the maximum extent will lower the arm 9U out of operative contact with lever 42, and, hence, interrupt the operation of the machine. The use of pedal may be resorted to for momentarily interrupting the driving action of the machine without shutting @if the power to the motor.

For the purpose of effecting a precise adjustment of the angular position 0f member 84 for effecting a predetermined length of stroke of the carriage S, a rod Qi is shownpivotally connected to the member 84 at 92. The upper end of the rod Si is threadedly received within an internally threaded sleeve e3, having an outwardly turned fiange d4 at its lower end. The sleeve 3 is provided with a longitudinal keyway 95 at its outer surface, within which is seated a key et carried by a gear Si, which is rotatably supported by a bracket e3 which, in turn, is secured for support to the front wall of the casing lil. The bracket 33' also supports a shaft Si), provided at its outer end with a crank mi? and at its inner end with a pinion mi, which meshes with the gear el. Rotation of the crank tilt rotates the gear i9! and, in turn, rotates also the gear 91, which, by reason of the keyed connection thereof with the sleeve 93,`effects rotae tion of the sleeve and thereby relative movement ofthe sleeve upon the threaded'end of the shaft 9i. Such rotary movement of the sleeve adjusts vertically upwardly or downwardly along the shaft and thereby elevates or lowers the outer end of the pivoted support 34 and thus raises or lowers the arm Sti with reference to the adjacent end of the lever 42 for varying the effective length of the arm with respect to the rocking 75 movement imparted thereby to the lever 42.

Afspring l Q5 "is shown disposedbetween` their:

flange ed' of the sleeve 'S3-and a stationaryspringl support H345 The spring under compression;4

thus supports the sleeve 93.' againstA downward movement from the position shown inflig.y l1, andi hence, during rotation of the sleeve upon operation of the crank wlL'theShaft el islmoved downwardly or upwardly, depending upon the direction of the operation of the crank.

Itwillrbeseen that the crank lfconstitutes for adjustingth'e'effective throw 'of leverSEJ, and, hence, for. selectingVv the length of `the `operating stroke of the. carriage.

YAniindicator |65 is shown inFig. 1l secured to thei rod i?! projecting through a slot in the front wall of the casing lli' and terminating a pointer mii. The pointer or indicator is slidable vertically along. a plate lill adjacent the slot and' whichmaybear graduations for indicating to .theV` operator various positions of adjustment oftheLmember ifi for providing the length'of the working stroke of the carriage required. The strolrefor" the carriage should, of course, be correlated with respect to the length of the copy sheets being used.'

In the form of invention shown in Figs. 11, l2 and i3 theplaten roller may be elevated to the position shown in '.7, either' manually, by operating the 'lever 8G, or by depression of a pedal ll-Bgas in theabove described modification the invention.

The structure above described not only provides-a foot-operable or a power-operable duplieating mechanism but the mechanism performs certain desirable functions during use, most of which will be obvious from an examination of the drawings. However, it is pointed out that when a copy sheet H has been fed into the carriage while the platen iroll 58 is in the elevated position shown in Fig. '7, the sheet is not withdrawn from the margin bar lil when the roll 5B is lowered to the operative position shown in Fig. 6. Since the pivotal axis 55 about which the roll 5S swings is located rearwardly of the pressure roll 55, roll 58 in being lowered from the position of '7 to the position of Fig. 6, tends to effect rotation oi roll in a counter-clockwise direction as viewed in Fig. 6 which movement tends to feed the sheet 'il forwardly to compensate for the retractive action effected by roll 5S upon the sheet as the latter moves to the lowermost position. It will thus be apparent that the two rolls and e5 cooperate not only for retaining the roll 58 in operative lowered position in stripping sheets from the duplicator ele* ment the rearward stroke of the carriage but they cooperate also, as described above, in retaining the lowermost edge of the copy sheets inthe intended margin-determining position as the roll 5S is moved into the lowered position from the position shown in Fig. '7.

The location o1" kthe pivotal member 56 near the rear of the carriage casing 3l avoids obstructing visibility of the margin bar which is adjacent the forward end of the casing when the carriage is in the position shown in Fig. 5. This arrangecontributes to uniformity in placement of the duplicated matter upon the sheets. The carriage casing preferably is moulded of a light weight plastic material, including the sheet guide 69 and may have a window or sight opening at the forward end to render the margin bar vclearly visible as the copy sheets are inserted.. Trans- 10 a convenient means at the front of the machine s parent Lplasticr may;` be employedor: the carriage?. casing if desired.

While I have shown andY described a structure i that. is illustrative of the invention, Vvarious changes in. details thereof mayA be 'resortedrto-.l without departure from the spirit of the 'invendtion.

I claim:

1. In a duplicating machina-a horizontally disposed at bed for supporting a duplicator elef ment, a carriage reciprocable forwardly and rearwardly along said bed over said element. and comprising means for-pressing copy sheets into copying contact with said element, means biasing said carriage for movement in one direction along Y said bed, a vertical guide beneath said bed, a vertically reciprocable head operable along said'-v guide, a link operatively connecting said carriage. and head, a pivoted lever having an actuatable arm atone'side of thefpivot and an operating arm atv the othersidefof the pivot, said latter arm being connected to' said `head for operating; the -same in one direction alongsaid guide for" effecting movement of said carriage in a direction Y in opposition to said biasing means, 'and `means foroperating said actuatable armof said' lever.

2.1In a duplicating machine, a horizontally dis.- Y posed dat bed for supporting a duplicatorele-v ment, a carriage reciprocable forwardly and rear; wardly along said bed over said. element andfcomprising means for pressing copy sheets into copy-'- ing contact with saidelement, means biasing saidcarriage for movement in one direction along said bed, a vertical guide located beneath said bed and forwardly of therearriage when thelatter is/in the position atwhich the same is moved by said biasing-means, a head reciprocable along said guide, a link pivotallyrconnected at the lower endv to said head and extending upwardly-and rearwardly into pivotal connection with said carriage, and means for moving said head downwardly for moving said link in directions to move said car.- riage horizontally along said bed in opposition to said biasing means.

3. In a duplicating machine, a Yhorizontally rdisposed bed for supporting a chiplicatorelement,v a carriage mounted over said bed for reciprocation longitudinally thereof forwardly and rearwardly and provided with means for pressing copy sheets into contact with said element, biasingmeans acting on said carriage for moving the same inV one direction toa given position, arvertically reciprocable member located beneath said carriage and forwardly thereof when in said given position, an inclined'linl; pivotally connected to` said carriage and to said head, a lever pivotally connected to said head for movingthe same vertically in a direction to cause said link to impart horizontal movement to said carriage from said given position, and means for actuating said lever.

4. In a duplicating machine,a horizontally disposed bed for supporting a duplicator element, a carriage mounted over said bed for reciprocation longitudinally thereof forwardly and rearwardly and provided with means for pressing copy sheets intocontact with said element,v biasing means. acting on said carriage for moving the same in one direction toa given position, avert'cally -reciprocable head located beneath said. carriage and forwardly thereof when in said given posi tion. an inclined link pivotally connected to said. carriage and to said head, a leverpivotally connectedto said head formoving the sameverti- Y .callyina rdirection tocause saidlinkto `impart 1 nected to said carriage and operable for eiecting l,

movement of the carriage along the bed in one direction, a motor provided with a rotating arm adapted to engage said lever for rocking the same, and adjustable means for the motor for shift-ing the same in directions for varying the range of rocking movement imparted to said lever by said arm for varying the length of stroke of the carriage.

6. In a duplicating machine comprising a bed for supporting a duplicator element, a carriage reciprocable along said bed, cooperating rotatable members carried by the carriage for laying copy sheets into copying contact with the element upon movement of the carriage in one direction and for stripping copy sheets from said element upon .y

movement of the carriage in the opposite direction, power means comprising a rotating arm engageable With said lever through an arcuate portion of each rotation thereof for actuating said carriage in said rst mentioned direction, energy storing means operatively connected to said carrage and energizable upon the movement of the carriage in said rst mentioned direction for effecting movement of said carriage in the opposite direction and manually operable means for ad` justing the position of said power means relative to said lever for effecting a selected variation in the length of movement of the stroke of said carriage.

7. In a flat bed type duplicator, a supporting structure provided with a bed for a duplicating element, a carriage operable over said element for pressing copy sheets into copying relation with respect thereto, a link pivotally connected at one end to said carriage beneath said bed, a reciprocable head pivotally connected to the opposite end of said link, means constraining said head for movement in a vertical direction for eiecting movement of said carriage over said element from a position adjacent one end of the bed, and means for effecting movement of said head in said direction through selected ranges for controlling the ranges of movement of said carriage over said element.

HUBERT JAGGER.

REFERENCES CITED The following references are of record in the iile of this patent:

UNITED STATES PATENTS Number Name Date 1,019,312 Flanigan Mar. 5, 1912 1,118,119 Flanigan Nov. 24, 1914 1,717,864 Williams June 18, 1929 1,746,642 Flanigan Feb. 11, 1930 1,767,577 Buchanan et al. June 24, 1930 1,967,694 Weide July 24, 1934 FOREIGN PATENTS Number Country Date 524,190 Germany May 4, 1931 

